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Description

Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596

PUBLISHED Reserved 2026-01-29 | Published 2026-03-02 | Updated 2026-03-02 | Assigner Mattermost




MEDIUM: 4.6CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

Problem types

CWE-829: Inclusion of Functionality from Untrusted Control Sphere

Product status

Default status
unaffected

Any version
affected

5.13.4.0
unaffected

Credits

N/A finder

References

mattermost.com/security-updates (MMSA-2026-00596) vendor-advisory

cve.org (CVE-2026-1628)

nvd.nist.gov (CVE-2026-1628)

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